From: Image quality of 4D in-treatment CBCT acquired during lung SBRT using FFF beam: a phantom study
Tube current: 20 mA | Tube current: 40 mA | |||||
---|---|---|---|---|---|---|
Mean, standard deviation (range) | Pearson correlation | Mean, standard deviation (range) | Pearson correlation | |||
r | p | r | p | |||
Number of projections acquired | 623 ± 225 (379–1170) | 617 ± 237 (346–1194) | ||||
Monitor units | 2063 ± 1221 (154–4525) | 0.92 | 0.00 | 2063 ± 1221 (154–4525) | 0.94 | 0.00 |
Contrast (%) | 8.1 ± 0.5 (7.4–9.1) | − 0.10 | 0.72 | 8.6 ± 0.5 (8.2–10.2) | − 0.41 | 0.12 |
Contrast-to-noise ratio | 5.7 ± 1.2 (3.1–8.1) | − 0.04 | 0.89 | 8.5 ± 1.5 (5.4–10.8) | 0.55 | 0.03 |
Overall uniformity (%) | 96.0 ± 2.5 (87.1–98.0) | 0.32 | 0.23 | 96.9 ± 1.9 (92.0–97.9) | 0.48 | 0.06 |
Minimum uniformity (%) | 97.2 ± 0.7 (95.6–98.0) | 0.31 | 0.24 | 98.2 ± 0.3 (97.3–98.7) | 0.59 | 0.02 |